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Other Comprehensive Income - Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Reclassifications, net of tax | $ (113) | $ (62)
Accumulated Defined Benefit Plans Adjustment, Actuarial Losses [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Other operating expenses | (143) | (94)
Defined Benefit Pension Items [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Income taxes | 30 | 32
Reclassifications, net of tax | $ (113) | $ (62)

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- Definition Amount before tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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